Rotary valve for engines and the like.



A. E. MOORHEAD.

ROTARY VALVE FOR ENGINES AND THE LIKE.

APPLICATION FILED JULY 28, 1911. 1 042371 2. Patented 0011.29, 1912 gSHEETS-SHEET 1.

A. E. MOORHBAD. ROTARY VALVE FOR ENGINES AND THE LIKE.

APPLICATION FILED JULYZB, 1911. 1 I

Patenteu Oct. 29, 1912.

5 SHEETS-SHEET 2.

diewjl/ A. E MQORHEAD. ROTARY VALVE FOR ENGINES AND THE LIKE.

APPLIGATIONIILBD JULY 28, 1911.

1,042,712. Patented 901%,1912.

5 SHBETSSHEET 3.

\VIIIIIIII'III A. B. MOORHEAD. ROTARY VALVE FOR ENGINES AND THE LIKE.

APPLICATION FILED JULY 28, 1911.

Patented Got. 29, 1912.

5 SHEETSSHEET 4 A. E. MOORHEAD. ROTARY VALVE FOR ENGINES AND THE LIKE.

APILICAIION FILED JULY 28, 1911.

nnnnn in so m n .Z'PIPTTWTZ in?) llflititrnlqn tine n t/in.

MOORHEAD,'OF CHICAGO, ILLINOIS, ASSiGNOR, BY MESNE ASSIG'NIVIEIETS, TU

A111 RICAN ROTARY VALVE COMPANY, OF CHICAGO, ILLINOIS, A CORPDRATEON 13F ZLLENOIS.

I 'RDTARY VELLVE FOR ENGINES AND THE LIKE.

Specification of Letters Patent.

Patented (let.

Application filed July 28, 1911. Serial No. 640,968.

Tb ui/ '71 mnif' may con 3cm:

it known that l ALBERT E. Moonnmn, u citizen of the United States, and u resident of Chicago, in the county of Cool; and State of Illinois, have invented certain new and useful Improvements in Rotary Valves for Engines and the Like; and 1 do hereby declare that the following is a. full, clear, ant exact description thereof, refer? ence beinghad to the accompanying dmw ings, and to the letters of reference marked thereon, which form a part of this SPECiilCB.

tiou.

This invention relates to improvements in.

rotary valves, and as shown herein is ap other devices in which fluids are handled.

In the drnvvings-Figure 1 is a view representing :1 vertical section through my improved engine, the said section being taken a plane containing the central axis of the crank shalt. Fig, 2 is u view representing an end elevation of my improved engine.

Fig. 3 view representing on an enlarged scale. a partial vertical section through Fig. 1 on the line 3-3 thereof. Fig. 1 is :1 view representing a partial vertical. section through Fig. 1 on the line 4--1 thereof. Fin. 5 is :1 view representing 11 vertical section through Fig. 1 on the line 5-5 thereof. Fig. is a view'representing a vertical section through Fig. 1 on the line t6 thereof. Fi 7 is a view representing a vertical section through the valve casing on the line 7- of Fig. 1. Fig. 8 is a ViQW represei'iting a vertical section through the valve casing on the line 88 of Fig. 1. Fig. 9 is a view representing a longitudinal section through the valve using on the line .99 of Fig. 3. Fig. 10 is a detail, verticuh'longitudiunl section of the valve, taken on u ohms extend in through the central axis thereof.

l lcferring noivin detail to that embodiment of my invention illustrated in the drawings, 10, 11, '12 and 13 indicate the four cylinders of a tour cycle engine; 10 1'1. 12 end 13, the respective pistons adapted for reciprocation in said cylinders; 14;, the 55 crank shaft and 10, 11. 12 and 13, the

respective connecting rods by which the several pistons are connected to the cm 11!; shaft. 15 indicates the crank casing incloslng the crank sluift. The several cylinders are procc vided with the usual. Water jackets 16, said water jackets being all connected together and supplied Withvvater by an inlet pipe 16 (see 2). Above said cylinders is located a cylindric valve casing which extends the full lengthot the engine and contains a. rotative valve member for each cylinder, ,szud rotative valve members, as

will presently appear, being all connected Each cylinder together to rotate as one. has an end Wall 17 provided with 21 large aperture or opening 17 The cylinders are provided beyond said end Wall with cylindric extensions 18, each connected to and openinginto the valve casing 20. As shown in the drawingsotbe cylinders and their extensions 18 are cast'integral with a semicylindric shell 19 which forms the lower half of the cylindric valve casing 20. The

upper half of said valve casing is formed by so a semi-cylindric shell 21 which has a longi tudinal flange 21ft secured by bolts 23 to the upper end ofthe main casting comprising, the cylinders and the lower half of the valve casing. A water jacket 22 is formed about 8 thelupper shell 21. As shovgn in Figs. 2 and 3, nflaterally extending pilssage 21 opens into the water jacket 22 of the upper shell .riear one end thereof and said passage is connected by a U-fitting 2 1 with a passage 1t) so opening into one of the cylinder jackets 16. flhus the cooling water, after circulating about the cylinders and the lower half of the valve casing- 21 passes into the jacket about the upper half of the some. fitting 21 has hn opening at one side surrounded .by a threaded boss 21 in which is secured the end of a discharge pipe 21 I Upon the end wall of each cylinder and Within the cylindric extensions 18 thereof, 1m;-

rests a block provided with a conical port opening 25 extending, vertically therethrough, the larger part of said opening being adjacent to and in communication with the opening 17 in the end vall .of the cylll inder. Said block is provided z t its upper end with a selui-c ylindric groove .26 which,

together with the liipper'shell 21 formsncy- The U- 9:;

llIMlFlC bean-111g lot the relellve Valve memhex new to he descr bed. Said block is pahle elfslis 1!; enrlwlse mevement under the nressui'e in he eyl'uulelu, so as to be forced closely :iguinsl, its esee'laled Valve plug.

2? indie-ales the 100 silver valve member as u wx'hele. Said valve member emngrises a plul'uliizy elf lenj'tuiliually spaced, hollow relative valve plug 28, one "for each cylinder, :incl each having retative hearing with in the valve casing 20. Each Valve plug '28 ",1; elf :1 length equal the diameter 0% the engine e yhndei', anal as shown in ie drawings compel. live seinl-eylinnliric shells anal 330 p1 viuing arzile exhaust and inlet ehzlu'abeys in the valve plug, The sl'lell 2-50 is elesecl along its dizunetrie plane by a well 3 0% The ether shelLQ) is also i l l g its d'le'zuesrie plane by a Wall rue walls ol the said shells Ll) antl wlns; each other. In the Wall Hell 29, near its en? are formed l he eeulr axis of Saul. holes coinu'ilih a, dime "1' of 1h shell extend-- weer i 1t right angles to 1 s ll 25 1112: Wall lhe shell l filled with recesses 30", each in lllun'ie" he. with One 01: said elves 52?)" of lOll Well, and celled. e -=i 1151011 sprin adapted eue encl agmhsl the in;,er ill: the shell 29 and at the lmttezn Walls of the Ztunstr uzlion is such that k 1155s tell z; e hollow valve plug apart, there l se'i fl W11 plug to have elese, eugngeuaei'll Wl' h its he ring Within. live ug. s Y'lll pe- 1 n'tl y appear, w .u ll A UIUIl the ail lull of the 'lllilH lhe cylinder, While prevules for the exhaust, and ,"hells will be lr'w'eufley refeneil to re i valve member or shell {25 member or shell; 30/

)l the several c nly [0 ea @elher so d all hllug lhe ex- All he 7 members 5:) lug each. at an 1 01. the next with euhl exhaust;

Wh ile lhe Hie line (the 7 mwn in fig,

the right, and 001ilhe first cylinder l l plug; of H10 j y angular posiplug 0f the '7 'ilrl t 1 haust ef the first eyllniler (see hi plug of the fourth cylinder, 270 with reference 110 the th and 450"" with reference to plug (see Fig". 6), these. relative iangemenls being thoserequire cylinders lire in Lhe usual 01 say, in the orfler elf the first, the

fourth and the second.

The exhaust members 30 of the second VillVu plugs are eom'iee ei' by low web 45, said web hmiu hi" -l;5 ,%l5,ucluplecl fer inner surface an the valve of. said Web, lie sill 45; in the 3:; planes of the Wells 30 l exhaust members of: the valve plug connected, but the iiilerruerllnt Web .is twisted through a qum that is to say l'hmugh an :1: exlmuslv members 31') of the ll valve plugs are connected by The exhaust members f (lialie valve plugs, that is U; szi' V and third plugs W an inclined. llut tube ell h2i,' lateral Walls all? mlnvp'teal ller MD with the inner sui'fuee cl she vain: (rush: and flat inclined Vells 26, formed a plurality e" L. Fig. {laid exhaust mex i said lube all lhei'; inner have their epposlle ends chased h Pllil walls 27. The inlet HlfilillJQiS 2A iuleiuuv lllul'e valve plugs are elesezl at l ends by end walls 48, while ends, the? is l0 say hose mljswe 25, are open. The inlet members and fourth valve plug 1' have th jueenl. the \YKl'JS posite ends are closed. by cu l u; likewemls of the eiilm memlu valve plugs are open 0i, GlHlH l CGIllQSZLlll wen are elm ei'ul well said Walls Ewing apex. 'ium wlai l lhe lniel'iei' of seal Wm;

shells. 'ln the valve CHFSl g 20 1-5 are (n'merl i2. 9.; 'porl's l with inlet passages (see l let passages eonneetel'l l3 inlo which opens inlet V let pipe eemieeled i0 2 shown) in the usual iilCllll-Eil "l6 51ml a casing heyeud the em. plugs, are le sated eenmmnieata with L Said exheus; pass huust pipes 56. The member viclei'l at its ends is" valve easing. Stiitl shaft is utlnptetl for longzituilinul movement in its bean-lugs. 21nd at one enrl. us shown in the drawings at. the left hand einl. there is tixerl upoirsnitl shaft oirveil wheel (it in the groove 61 ot .l. ene'n' 'e pins 2 rnrrietl hy u yoke tfi'l Hi the upper ein'l oi the :lrm 6- 1 pivot-ally eonneetwl to plates ('13. eenre=i to the eng'ine eusin The lower euil oi itl(l arm on; 11+ hiu u mun groove bit in :1 ruin heel no tit'll is "evetl to the'eruuk shaft v reuwn of this onsti'uotiou. the arm s euusetl to n illnte in u vertieul plune Itlltl to rwL-iprorute the valve shu'tt longt tuiliiuzlly in its hearings. on the shaft 58 is mounttl u beveletl near it.) whirl} has splineil iotillet'tioi. with the shaft. so that the liu't't will turn with the, gear but is iptetl to tie eutlwi e therein. in order to llul l suit to from moving: en'lwise the sloil t. the in b oi suit! gear ms :1 bearing hearing :it (He enufiuinst the plate till unit tit tin other euti uguii' stn hearing sleeve Tl annihrigitl with u casing Tl in whieh the em. ot the shzu' t extension 5 v has hearing. The beveled gear T0 is in mesh with :1 llCYtlt'tl ever 7; lcejietl to the upper end of :1 vertical shaft. 7 whirh hus lteyeil to its lower enil u beveleil geur 7-1: in mesh with a beveled gear 75 fixed. on the (Zlffitll' sluit't. These genre are such that the valve member is rotzitetl onee to two revolutions oi, the erunlc shaft.

Suitnhle. thrust members are formed on the integral valve member. of whieh the exhaust members of the valve plugs are partyto engripe the ends of the inlet valve members 29 v ul prevent them from moving longitudizuilv with ret'erenee to the exhaust valve embers uretormetl by the webs 45. :2 tuhe to. until the shaft extensions 57, 7 ch are ottset at their entls from the the exhaust members to which they eotnieetetl. thus providing shoulders 76 v-rlalvh eneugennuinst the ends of the inlet vnt e memlmrs Said shoulders hold said t valve members in proper relation with To evlnue-t vuive members so thututhe rovulve eien'iber. us a who e. may he reunder the action without disturbing at and exhaust valve the logatetl an oil oil to n terticnl oil hrough the top wall reas n of the longiniovenient ot' the rois oil evenly (listrih surface of the valve pit s-ai no or the t-utlinrtl i of each valve memvl orts. an exhaust n'ieuiber and an the As shown in the drawings. said inlet port 81 in the inlet. valve member. Said orts are s acetl from each other an angular istance o mini the tlimuetric plane be tween said valve members divides this angle into two equal parts. Said ports are so rnugeil relatively to the length of the valve in succession with the upper smaller entl of the, port opening 25 in the eylindrie block The operution oi the engine is us follows: Consider the parts in the relative positions illustrutetl in the thuwings with the rotutive valve member 25 rotating in the direction initirntetl by the urrows. The piston oi the first e viiniler (numbering from the left) has just Completed its exhuuststroke and. is about to begin its inlet stroke, the exhaust port S9 of the associated valve plug having just pussetl the eylintler port opening 25 and to register with said cylinder port opening. l The piston ot the seeontl eylintler has inst eonipleteil its inlet stroke and to l'iep'in its eompression stroke. sition of the rotntive 've l5 hetween the first two valve plugs in position to (lireet the explosive mixture the inlet port 51, into the open end of the inlet valve member 39 of the first valve plug and to cut oil said port 51 so as to prevent any explosive mixture passing therefrom to the open egnl of the inlet valve member of the seooniil valve plug (see Fig. 7). The first piston proceeds on its inlet stroke. and us it does so the. inlet port 81 homes to register with the cylinder port 25. A supply of explosive mixture is drawn into the cylinder, the same passing from the inlet port 51 into the vtilve'eusing. then between the well of the valve casing and the web 45 into the open end of the inlet valve member 29 or" the ports 81 and 25 into the cylinder. in the meantime the second piston has been melting its compression stroke. By reason of the pressure of the expansion springs 4E0, the valve members are lieltl tightly engaged. against the inner surface of the valve casing, thus making a tight joint and preventing any possibility of leakage under the force out the compression stroke, In atltlition the pressure of the gas against the exposed hose of the plug 2-1t. torces suitl plug 2; up against the valve plug. thus making a tight joint rrtr all points of the periphery of the valve plu By the ime the pistons have renehetl the entls of their respeetive strokes. the valve nieniher has rotntetl through un Angle of 90 :HKl the ports ofthe first valve plug hnve eo'me to the position oeuupietl by those of the second valve plug. shown in the draw ing's. and those of the second to the position 1 occupied by those of the fourth valve plug,

.the inlet port 81 being: just about; to come I plug that they are adapted to come to register tuluptetl to enter the valve casing 20 through first valve plu and thence through the neeavis shells being open, one at one end and the other at the opposite end, of the valve plug, and the open ends of the inlet and outlet shells being adapted for communication with the inlet and exhaust passages of the valverasing, and means applied to yieldingly force apart the said valve shell members,

i. The combination of a cylinder, a valve casing provided with inlet and exhaust pas sages and with a port in communication with the cylinder, a movable block forming a part of the wall otthe valve casing and containing said cylinder port, said block having a part providing an area exposed to the interior of the cylinder, a rotative valve plug having bearing in said-casing,- said valve plugs comprising semicylindric shells. one constituting an inlet member and the other an exhaust member, and each provided in its cylindric wall with a port adapted to register with the cylinder port; said inlet and outlet shells being provided with openings tor communication with the inlet and exhaust passages of the valve casing, and means acting to yieldingly force apart said valve shell members.

In combination with a cylinder, a valve provided with a cyli'ndric valve chamoer and with inlet and exhaust pas sages,-;t rotative cylindric valve plug having bearing in said valve chamber, .a movable block provided with a port connecting the interior of the cylinder with the valve chamber; one end of said block having an area exposed to the interior of the cylinder and the opposite end of said block being wider than the diameter of the valve plug and provided with a recess, semi-circular in crosssection, forming a bearing surface adapted for contactwithone-half of the.

circumference of the valve plug; the said valve plug having one-half of its cflindric surface in bearing contact with the inner surface of the valve casing and one-half of its circumference in bearing contact with the said movable blocl ,'a'r1d being provided with circumferentially spaced inlet and exhaust ports adapted ,to coact with said port in movable block, and means actingito give continuous endwise, reciprocatory mo- .L the tion to said valve plug, simultaneously with its rotative movement. r H

The combination of a cylinder, a valve casing provided with a cylindric valve chamber, with inlet and exhaust passages and a port in communication with the cyl inder, a 'i'otative cylindric valve plug having bearing in said casing, said valve plug comprising semi-cylindric shells, one constituting an inlet member and'the other an exhaust member, and each provided in its cvlindric wall with a port adapted to register with the cylinder port, said inlet and r vliaust shells being provided with openings tor communication with the inlet and exhaustpassages of the casing, means acting to yieldingly force apart said valve member shells, and means acting to give continuous endwise reciprocatory motion to said valve ment.

'7. The combination of a cylinder, a valve casing provided with a cylindric valve chamber, with inlet and exhaust passages, and with a port communicating with the cylinder, a movable block forming a part of the wall of the valve casing and containing said cylinder port, said block having a part providing an area exposed to the interior of the cylinder, a rotative valve plug having bearing in the said casing, said valve plug compnsing semi-cylindric she'lls, one constituting an inlet and the other an exhaust memher, and each provided in its cylindric wall with port adapted to re ister with the cylinder port, said inlet and exhaust shells being provided with openings for communication with the inlet and exhaust passages of the casing, means acting to yieldingly fierce apart said valve shell members, and means catory motion to said valve plug, simultaneously with its rotative movement.

8. The combination of a valve casing provided with a cylindric valve chamber, with inlet and exhaust passages and with a port for both inlet and exhaust, a rmative cylindric valve plug having bearing in said casing, said valve plug comprising semi-cylindric shells, one constituting, an inletmember and the other an exhaust member, and each provided in its cylindric wall with a port adapted to register with said inlet and exhaust ports, said inlet and exhaust shells being provided with openings for communication with the inlet and exhaust passages of the casing, interlocking means on the said shells adapted to hold the same from relative endwise movement. means acting to yieldingly force ous, endwise reciprocatory. motion to said. va ve-plug, simultaneously with its rotative m element. i

ii. The combination with a valve casing having a cip lindrio valve chamber and pro- ,ided with-5a plurality of longitudinally paced ports for both inlet and exhaust, oi a rotativc valve member having bearing in said casing, said valve member comprising a plurality of longitudinally spaced, hollow, cy'lindrio' valve plugs, one for each inlet and exhaust port, each valve plug consisting of two semi-cylindric shells, one constituting an inlet and the other an exhaust member, one opening at one end and the'other opening at the opposite end of said plug into the valve chamber, and each provided with a port in its eylindric wall adaptedto register with one of the inlet and exhaust ports, conplug, simultaneously with its rotative move-' actin to ive continue s endwise reciroapart said valve member shells, and means acting on one of, said shells to give cont1nu.

" mixers rigi lly uniting one end of Hell meiiibers of each valve plug zieen't encl 0f one of the shell {U1 adjacent valve plug, and zu't'inp; t0 yieldingly ioice apart the of each plug; mid valve caseviclecl will: idle; and exhaust male of the inlet and exhaust shell combination with 21 valve easing n, eylim valve chamber anml proiwe lengituclinally spaced ports inlet and eximue't, of a rotative ier liming bearing in said casing, member comprising two lengitw spaced, hollow, cylindric valve for each inlet anzl exhaust ptlrt, "e plug being providefi with an in and till eiilmusi chamber, 011e, opening at V e mi Zuni the other aft the opposite encl with an inlet port and an pm lm ii adapted to register with let and exhaust ports, and a ll, tubular web member exbetween plugs 2171161 forming a e connecting the exhaust chambers of V iil valve 0: sing being providecl leiv id *haugt passages adapted for .iunieatieii Milli llie open encls of the Ml eziluiust lmmbers. lie The combine.

w a e y'liwlrie "wilveehamber and pmwith we lengitmlinally spaced ports ill in :iml exhausli, of e rotative mbei' having bearing in said eastzih e membei? comprising tWO loniced, liollew,- cylindric valveeach inlet and exhaust port, lug beingprovicled with an inexhmzst chamber, one opening at tli: other mt the opposite end of 0 the valve chamber, and. m its will with an inlet and exlie'usi ch zeriptel to register with ene of we exhaust poi-LS and a spirally :3 member extencling between said and he'viiigits lateml'edges in bear: gement with the valve casi lgsaid cs being provided W'itlifinlet elitiiust passages adapted 02" eomm'unicatio'n i em epeiiieiids m": the inlet 21ml exhaust chambers A v I .ie combination with a valve casing cyli'mlric: Valve cliamber will proiifn iwo l'e i ituelinelly spaced ports both i'ilet mid exhaust, of a; rotative ai ing bearing said easing,

ilbfil comgrisiiig @Wo longitui, hollow eylinclric, -,wilve i' each inlet and GXll'ELllSt port;

pied filer ('ommunicauion With' tlen with a valve easing niea-tion with the open. ends 01 the inlet chambers.

13w eemliineiion 'ii'iih a valve ig having eylindric valve chamber previclecl "with two ieiigitiidimil y spaced parts for bozn inlei 21ml exlieuel 0i :i rem-hive valve member having Bearing in. saicl valve member eempi-io "valve plug hell 4 exhaust chamber. J the other 255 Mm epposiie eucl of set Wall Wiili an inlet an ezilmiis't p adapted to register with one bi me exhaust erle, and an epeiiured, tened, tubular member extending between said plugs and connected with we open. of the exhaust chambers, said tubular mem lier'having iis SiiCl'E, margins in. beziiii1gen-- gagemeni; w .Jl saiei easing, -sairl i a w: casing being" provided. aiile'stlmust passage 'eapfiecl lei comm lllfiillllflii i-lzireugli loular inembey W' e open emis of ain? 2;. haust chambers, with inlet passages adapted for eoinniimication with epeii ends of the inlet chambers.

l ly 'llmeombi lion Wliill a valve easing having a ylin e, valve elieimbei? previdecl with e plurality 01E longiiudii spacecl ports 01 both inl d eil-naiie-gei 'otative valve member ,hzis li'lg beefin plurality of leiigiiudiimily spaced cylindi-ie valve pim s, one 01- each inlet'mfi exhausfi poi-t eecli valve plug; being pTQ-- vicled Wiilie n inlet and .8 11 exhaust elimni ei",

other end of said .valve ilu Sm i 'elve cliairiloer and iii-its flyilfldllfi' Wall EJlilh an said casing, said valve meiiieei' comprising;

'one opening atone end. aiul'tlie-nlliei' the having a cylindrie valve ehamher and provided with two longitudinally spaced ports for hoth inlet and exhaust, of a rotativc valve meniher hating hearing in said'easing, said valve nemher eon'iprising two longitudinally spaced, hollow, cylindric valve plugs, one for each inlet and exhaust port, ea -l valve plug consisting of two semieylindric shells, one constituting an inlet member and the other an exhaust member, each pr 1-vided with a port on its cylindric wall adapted to register with one, of said inlet and exhaust ports, the inlet shell memh" openingat the adjacent ends of the plugs and the exhaust shell members opening at the opposite ends of said plugs into the valve chamber, a spirally twisted, tuhular weh member rigidly connecting with each other the closed ends of the exhaust "tell members and forming an exhaust pashelween the same, and means acting to vicldingfly force apart the shell niemhers of each valve plug, said valve casing being provided with inlet and exhaust passages adapted for communication with the open cnds of the inlet and exhaust shell inemhers.

to. The combination with. a valve casing having a eylindric valve chamber and provided with two longitudinally spaced ports or lath inlet and exhaust, ot' a rotativc' valve memher having hearing in said casing, said valve member comprising two longi tu linally spaired, .hollow, cylindric valve plugsgone tor each inlet and exhaust port,

each valve plug consisting-0t two semic vlintlric shells, one ctmst-ituting an inlet member and the othe' an exhaust member, and each provided with a port in its cylindrie wall adapted to register with one of said inlet and evhaust ports. the exhaust shell inemhers openii at the adjacent ends of the plugs and the inlet shell IllQllllJClf Opening at the opposite ends of said plu into the valve casin an ai )ertured, flattened. tubular meni rigidly conneeting with each iother the adj-at ent open ends of the exhau it shell memhers, and means a(:tinn to yie dinglv force apart the said shell nien'al' of each valve plug, said valve (asheingprovided with an exhaust passage llLiiDl'Cll flOl eoinuninication, through said tubular member. with the open ends of the exhaust shell members and with inletpassages adapted tor chmmunication with the open ends of the inlet-'shell inemhers.

IT. The coinhination with a cylindrie valve casing provided with a plurality of longitudinally spaced ports For both inlet and exhaust. a rotalive valve member havinn" hearing in said casing, said rotative valve memher comprising a plurality of lonqiiudinally spaced. hollow, eylindric valve plugs, one plug {or each inlet and exhaust port, each v: lro glug comprising semivalve ehan'iber, and each provided with a port in its cylindrie wall adapted to register with one oi said inlet and exhaust ports, means rigidly connecting all of one set of said valve shells, and means a sting to yield ingly force apart the associated valve plug shell members, said being provided intermediate said valve plug and at its ends ith inlet and exhaust ports arranged in alternation.

18. The combination Wllill a cylindric valve, casing provided with plurality of longitudinally spaced ports for both inlet and exhaust, ot' a rotative valve member having hearing in said casing, said rotativc valve member comprising a plurality of iongitudinally spaced valve plugs, one plug for each inlet and outlet port, each valve plug comprising sQmi-cylindric shells, constituting an exhaust shell member and an inlet shell member, the one opening at one end and the other opening at the opposite end of the plug nto the val e casing, and each provided with port in its eylindric wall adapted to register with one of the inlet and outlet ports, twisted weh members connecting the adjacent closed ends of the exhaust shell members, flattened, apcrtured, tubular members connecting; the adjacent openends of the exhaust shell members, expansion springs adapted for forcing the as soeiated valve plug shell members apart, said casing being provided oppi'lsite said web incmloers with inlet ports, and opposi c said flattened tubular members and atits ends with exhaust ports, end plates closing the ends 01" said valvecltsing, and shaft extensions rigid wvith tl1t T"eXhniist shell n'iemhers of the end valve plugs and having hearing in the. said plates;

19. The combination with it cylindric valve casing provid e d with a plurality of longitudinally spacsdpcrts for both inlet and ex naust, of a roll comprising-- a plurality o't lfmgitui'linally spaced valve lu s, one plug for each inlet r c i i ,7

and exhaust port, oat-h valve plug comprising semi-cylindric shell constituting; an 611- haust. shell inen'iher and ,an inlet. shell runny her, the one? opening at one end and the other opening at the opposite end of the plug into the, valve casing, and each provided with a port in its cylindric wall ads; d. to register with one. of the inlet and exhaust ports, means rigidly connecting the exhaust shell members with each other, .nieans acting; to yieldimrlv 'l'oi'ee apart the asv Tinted shell n'mmhors of each valve plug, said casing being provided with inlet and exhaust passages adapted for comnzuniz'ation with the open ends ct said inlet and exhaustshell:

val ve member 

